If you have ever wanted to fire 9mm luger out of your AR-15 rifle, then checkout the Yankee Hill Specter Black Diamond AR-15 Upper Conversion Kit. This kit inlcudes a complete 9mm Luger chambered upper with flip up iron sights. You also get all the parts necessarry to convert your complete .223 Remington/5.56 NATO lower to shoot 9mm Luger. The barrel on the upper is 16" and comes with a free float quad rail.